Date: Mon, 25 Oct 1999 12:53:35 +0100 From: Ben Smithurst <ben@scientia.demon.co.uk> To: Jeroen Ruigrok/Asmodai <asmodai@wxs.nl> Cc: "Daniel F. Zucker" <dazucker@pacbell.net>, FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Can't get aliasing to work for sendmail Message-ID: <19991025125334.A1963@strontium.scientia.demon.co.uk> In-Reply-To: <19991025073744.C20411@daemon.ninth-circle.org> References: <01BF1E24.4E6103E0@test5.pacbell.net> <19991025073744.C20411@daemon.ninth-circle.org>
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Jeroen Ruigrok/Asmodai wrote:
> IIRC any host wishing to receive mail has got to have MX records in DNS.
You don't RC. :-) From RFC 974:
It is possible that the list of MXs in the response to the query will
be empty. This is a special case. If the list is empty, mailers
should treat it as if it contained one RR, an MX RR with a preference
value of 0, and a host name of REMOTE. (I.e., REMOTE is its only
MX). In addition, the mailer should do no further processing on the
list, but should attempt to deliver the message to REMOTE. The idea
here is that if a domain fails to advertise any information about a
particular name we will give it the benefit of the doubt and attempt
delivery.
I *think* this means an MTA should just find an address for REMOTE,
whether that be directly from an A record, or indirectly through
REMOTE's CNAME. (I'm sure about the first bit, I'm just not sure how
CNAMEs fit into all this.)
--
Ben Smithurst | PGP: 0x99392F7D
ben@scientia.demon.co.uk | key available from keyservers and
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